<template>
	<view class="uni-stat__select">
		<span v-if="label" class="uni-label-text hide-on-phone">{{ label + '：' }}</span>
		<view class="uni-stat-box" :class="{ 'uni-stat__actived': current }">
			<view
				class="uni-select"
				:class="{ 'uni-select--disabled': disabled, 'uni-select--wrap': shouldWrap, 'border-default': mode == 'default', 'border-bottom': mode == 'underline' }"
			>
				<view class="uni-select__input-box" @click="toggleSelector" :class="{ 'uni-select__input-box--wrap': shouldWrap }">
					<view v-if="slotSelected" class="slot-content padding-top-bottom" :class="{ 'uni-select__input-text--wrap': shouldWrap }">
						<slot name="selected" :selectedItems="getSelectedItems()"></slot>
					</view>
					<template v-else>
						<view v-if="textShow" class="uni-select__input-text" :class="{ 'uni-select__input-text--wrap': shouldWrap }">
							<view class="padding-top-bottom" :class="'align-' + align">{{ textShow }}</view>
						</view>
						<view v-else class="uni-select__input-text uni-select__input-placeholder" :class="'align-' + align">{{ typePlaceholder }}</view>
					</template>
					<view key="clear-button" v-if="!hideRight && shouldShowClear && clear && !disabled" @click.stop="clearVal">
						<uni-icons type="clear" color="#c0c4cc" size="24" />
					</view>
					<view key="arrow-button" v-else-if="!hideRight">
						<uni-icons :type="showSelector ? 'top' : 'bottom'" size="14" color="#B19561" />
					</view>
				</view>
				<view class="uni-select--mask" v-if="showSelector" @click="toggleSelector" />
				<view class="uni-select__selector" :style="getOffsetByPlacement" v-if="showSelector">
					<view :class="placement == 'bottom' ? 'uni-popper__arrow_bottom' : 'uni-popper__arrow_top'"></view>
					<scroll-view scroll-y="true" class="uni-select__selector-scroll">
						<template v-if="slotEmpty && mixinDatacomResData.length === 0">
							<view class="uni-select__selector-empty">
								<slot name="empty" :empty="emptyTips"></slot>
							</view>
						</template>
						<template v-else>
							<view v-if="mixinDatacomResData.length === 0" class="uni-select__selector-empty">
								<text>{{ emptyTips }}</text>
							</view>
						</template>
						<template v-if="slotOption">
							<view v-for="(itemData, index) in mixinDatacomResData" :key="index" @click="change(itemData)">
								<slot
									name="option"
									:item="itemData"
									:itemSelected="multiple ? getCurrentValues().includes(itemData.value) : getCurrentValues() == itemData.value"
								></slot>
							</view>
						</template>
						<template v-else>
							<view
								v-if="!multiple && mixinDatacomResData.length > 0"
								class="uni-select__selector-item"
								v-for="(item, index) in mixinDatacomResData"
								:key="index"
								@click="change(item)"
							>
								<text :class="{ 'uni-select__selector__disabled': item.disable,'uni-select__selector__isactive': isSelected(item) }">{{ formatItemName(item) }}</text>
							</view>
							<view v-if="multiple && mixinDatacomResData.length > 0">
								<checkbox-group @change="checkBoxChange">
									<label class="uni-select__selector-item" v-for="(item, index) in mixinDatacomResData" :key="index">
										<checkbox :value="index + ''" :checked="getCurrentValues().includes(item.value)" :disabled="item.disable"></checkbox>
										<view :class="{ 'uni-select__selector__disabled': item.disable, 'uni-select__selector__isactive': isSelected(item) }">
											{{ formatItemName(item) }}
										</view>
									</label>
								</checkbox-group>
							</view>
						</template>
					</scroll-view>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
/**
 * DataChecklist 数据选择器
 * @description 通过数据渲染的下拉框组件
 * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
 * @property {String|Array} value 默认值，多选时为数组
 * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
 * @property {Boolean} clear 是否可以清空已选项
 * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
 * @property {String} label 左侧标题
 * @property {String} placeholder 输入框的提示文字
 * @property {Boolean} disabled 是否禁用
 * @property {Boolean} multiple 是否多选模式
 * @property {Boolean} wrap 是否允许选中文本换行显示
 * @property {String} placement 弹出位置
 * 	@value top   		顶部弹出
 * 	@value bottom		底部弹出（default)
 * @property {String} align 选择文字的位置
 *  @value left 显示左侧
 *  @value center 显示中间
 *  @value right 显示 右侧
 * @property {Boolean} hideRight 是否隐藏右侧按钮
 * @property {String} mode 边框样式
 *  @value default 四周边框
 *  @value underline 下边框
 *  @value none 无边框
 * @event {Function} change  选中发生变化触发
 * @event {Function} open  选择框开启时触发
 * @event {Function} close  选择框关闭时触发
 * @event {Function} clear  点击清除按钮之后触发
 */

export default {
	name: 'uni-data-select',
	mixins: [uniCloud.mixinDatacom || {}],
	emits: ['open', 'close', 'update:modelValue', 'input', 'clear', 'change'],
	model: {
		prop: 'modelValue',
		event: 'update:modelValue'
	},
	options: {
		// #ifdef MP-TOUTIAO
		virtualHost: false,
		// #endif
		// #ifndef MP-TOUTIAO
		virtualHost: true
		// #endif
	},
	props: {
		localdata: {
			type: Array,
			default() {
				return [];
			}
		},
		value: {
			type: [String, Number, Array],
			default: ''
		},
		modelValue: {
			type: [String, Number, Array],
			default: ''
		},
		label: {
			type: String,
			default: ''
		},
		placeholder: {
			type: String,
			default: '请选择'
		},
		emptyTips: {
			type: String,
			default: '无选项'
		},
		clear: {
			type: Boolean,
			default: true
		},
		defItem: {
			type: Number,
			default: 0
		},
		disabled: {
			type: Boolean,
			default: false
		},
		// 格式化输出 用法 field="_id as value, version as text, uni_platform as label" format="{label} - {text}"
		format: {
			type: String,
			default: ''
		},
		placement: {
			type: String,
			default: 'bottom'
		},
		multiple: {
			type: Boolean,
			default: false
		},
		wrap: {
			type: Boolean,
			default: false
		},
		align: {
			type: String,
			default: 'left'
		},
		hideRight: {
			type: Boolean,
			default: false
		},
		mode: {
			type: String,
			default: 'default'
		}
	},
	data() {
		return {
			showSelector: false,
			current: '',
			mixinDatacomResData: [],
			apps: [],
			channels: [],
			cacheKey: 'uni-data-select-lastSelectedValue'
		};
	},
	created() {
		this.debounceGet = this.debounce(() => {
			this.query();
		}, 300);
		if (this.collection && !this.localdata.length) {
			this.debounceGet();
		}
	},
	computed: {
		typePlaceholder() {
			const text = {
				'opendb-stat-app-versions': '版本',
				'opendb-app-channels': '渠道',
				'opendb-app-list': '应用'
			};
			const common = this.placeholder;
			const placeholder = text[this.collection];
			return placeholder ? common + placeholder : common;
		},
		valueCom() {
			if (this.value === '') return this.modelValue;
			if (this.modelValue === '') return this.value;
			return this.value;
		},
		textShow() {
			// 长文本显示
			if (this.multiple) {
				const currentValues = this.getCurrentValues();
				if (Array.isArray(currentValues) && currentValues.length > 0) {
					const selectedItems = this.mixinDatacomResData.filter((item) => currentValues.includes(item.value));
					return selectedItems.map((item) => this.formatItemName(item)).join(', ');
				} else {
					return ''; // 空数组时返回空字符串，显示占位符
				}
			} else {
				return this.current;
			}
		},
		shouldShowClear() {
			if (this.multiple) {
				const currentValues = this.getCurrentValues();
				return Array.isArray(currentValues) && currentValues.length > 0;
			} else {
				return !!this.current;
			}
		},
		shouldWrap() {
			// 只有在多选模式、开启换行、且有内容时才应用换行样式
			return this.multiple && this.wrap && !!this.textShow;
		},
		getOffsetByPlacement() {
			switch (this.placement) {
				case 'top':
					return 'bottom:calc(100% + 0px);';
				case 'bottom':
					return 'top:calc(100% + 0px);';
			}
		},
		slotSelected() {
			// #ifdef VUE2
			return this.$scopedSlots ? this.$scopedSlots.selected : false;
			// #endif
			// #ifdef VUE3
			return this.$slots ? this.$slots.selected : false;
			// #endif
		},
		slotEmpty() {
			// #ifdef VUE2
			return this.$scopedSlots ? this.$scopedSlots.empty : false;
			// #endif
			// #ifdef VUE3
			return this.$slots ? this.$slots.empty : false;
			// #endif
		},
		slotOption() {
			// #ifdef VUE2
			return this.$scopedSlots ? this.$scopedSlots.option : false;
			// #endif
			// #ifdef VUE3
			return this.$slots ? this.$slots.option : false;
			// #endif
		}
	},
	watch: {
		showSelector: {
			handler(val, old) {
				val ? this.$emit('open') : this.$emit('close');
			}
		},
		localdata: {
			immediate: true,
			handler(val, old) {
				if (Array.isArray(val) && old !== val) {
					this.mixinDatacomResData = val;
				}
			}
		},
		valueCom(val, old) {
			this.initDefVal();
		},
		mixinDatacomResData: {
			immediate: true,
			handler(val) {
				if (val.length) {
					this.initDefVal();
				}
			}
		}
	},
	methods: {
		getSelectedItems() {
			const currentValues = this.getCurrentValues();
			let _minxData = this.mixinDatacomResData;
			// #ifdef MP-WEIXIN || MP-TOUTIAO
			_minxData = JSON.parse(JSON.stringify(this.mixinDatacomResData));
			// #endif
			if (this.multiple) {
				return _minxData.filter((item) => currentValues.includes(item.value)) || [];
			} else {
				return _minxData.filter((item) => item.value === currentValues) || [];
			}
		},
		debounce(fn, time = 100) {
			let timer = null;
			return function (...args) {
				if (timer) clearTimeout(timer);
				timer = setTimeout(() => {
					fn.apply(this, args);
				}, time);
			};
		},
		// 检查项目是否已选中
		isSelected(item) {
			if (this.multiple) {
				const currentValues = this.getCurrentValues();
				return Array.isArray(currentValues) && currentValues.includes(item.value);
			} else {
				return this.getCurrentValues() === item.value;
			}
		},
		// 获取当前选中的值
		getCurrentValues() {
			if (this.multiple) {
				return Array.isArray(this.valueCom) ? this.valueCom : this.valueCom ? [this.valueCom] : [];
			} else {
				return this.valueCom;
			}
		},
		// 执行数据库查询
		query() {
			this.mixinDatacomEasyGet();
		},
		// 监听查询条件变更事件
		onMixinDatacomPropsChange() {
			if (this.collection) {
				this.debounceGet();
			}
		},
		initDefVal() {
			let defValue = this.multiple ? [] : '';
			if ((this.valueCom || this.valueCom === 0) && !this.isDisabled(this.valueCom)) {
				defValue = this.valueCom;
			} else {
				let strogeValue;
				if (this.collection) {
					strogeValue = this.getCache();
				}
				if (strogeValue || strogeValue === 0) {
					defValue = strogeValue;
				} else {
					let defItem = this.multiple ? [] : '';
					if (this.defItem > 0 && this.defItem <= this.mixinDatacomResData.length) {
						defItem = this.multiple ? [this.mixinDatacomResData[this.defItem - 1].value] : this.mixinDatacomResData[this.defItem - 1].value;
					}
					defValue = defItem;
				}
				if (defValue || defValue === 0 || (this.multiple && Array.isArray(defValue) && defValue.length > 0)) {
					this.emit(defValue);
				}
			}

			if (this.multiple) {
				const selectedValues = Array.isArray(defValue) ? defValue : defValue ? [defValue] : [];
				const selectedItems = this.mixinDatacomResData.filter((item) => selectedValues.includes(item.value));
				this.current = selectedItems.map((item) => this.formatItemName(item));
			} else {
				const def = this.mixinDatacomResData.find((item) => item.value === defValue);
				this.current = def ? this.formatItemName(def) : '';
			}
		},

		/**
		 * @param {[String, Number, Array]} value
		 * 判断用户给的 value 是否同时为禁用状态
		 */
		isDisabled(value) {
			if (Array.isArray(value)) {
				// 对于数组，如果任意一个值被禁用，则认为整体被禁用
				return value.some((val) => {
					return this.mixinDatacomResData.some((item) => item.value === val && item.disable);
				});
			} else {
				let isDisabled = false;
				this.mixinDatacomResData.forEach((item) => {
					if (item.value === value) {
						isDisabled = item.disable;
					}
				});
				return isDisabled;
			}
		},
		clearVal() {
			const emptyValue = this.multiple ? [] : '';
			this.emit(emptyValue);
			this.current = this.multiple ? [] : '';
			if (this.collection) {
				this.removeCache();
			}
			this.$emit('clear');
		},
		checkBoxChange(res) {
			let range = res.detail.value;

			let currentValues =
				range && range.length > 0
					? range.map((item) => {
							const index = parseInt(item, 10);

							if (isNaN(index)) {
								console.error(`无效索引: ${item}`);
							}

							if (index < 0 || index >= this.mixinDatacomResData.length) {
								console.error(`索引越界: ${index}`);
							}

							return this.mixinDatacomResData[index].value;
					  })
					: [];
			const selectedItems = this.mixinDatacomResData.filter((dataItem) => currentValues.includes(dataItem.value));
			this.current = selectedItems.map((dataItem) => this.formatItemName(dataItem));

			this.emit(currentValues);
		},
		change(item) {
			if (!item.disable) {
				if (this.multiple) {
					// 多选模式
					let currentValues = this.getCurrentValues();
					if (!Array.isArray(currentValues)) {
						currentValues = currentValues ? [currentValues] : [];
					}

					const itemValue = item.value;
					const index = currentValues.indexOf(itemValue);

					if (index > -1) {
						currentValues.splice(index, 1);
					} else {
						currentValues.push(itemValue);
					}

					const selectedItems = this.mixinDatacomResData.filter((dataItem) => currentValues.includes(dataItem.value));
					this.current = selectedItems.map((dataItem) => this.formatItemName(dataItem));

					this.emit(currentValues);
				} else {
					// 单选模式
					this.showSelector = false;
					this.current = this.formatItemName(item);
					this.emit(item.value);
				}
			}
		},
		emit(val) {
			this.$emit('input', val);
			this.$emit('update:modelValue', val);
			this.$emit('change', val);
			if (this.collection) {
				this.setCache(val);
			}
		},
		toggleSelector() {
			if (this.disabled) {
				return;
			}

			this.showSelector = !this.showSelector;
		},
		formatItemName(item) {
			let { text, value, channel_code } = item;
			channel_code = channel_code ? `(${channel_code})` : '';

			if (this.format) {
				// 格式化输出
				let str = '';
				str = this.format;
				for (let key in item) {
					str = str.replace(new RegExp(`{${key}}`, 'g'), item[key]);
				}
				return str;
			} else {
				return this.collection.indexOf('app-list') > 0 ? `${text}(${value})` : text ? text : `未命名${channel_code}`;
			}
		},
		// 获取当前加载的数据
		getLoadData() {
			return this.mixinDatacomResData;
		},
		// 获取当前缓存key
		getCurrentCacheKey() {
			return this.collection;
		},
		// 获取缓存
		getCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			return cacheData[name];
		},
		// 设置缓存
		setCache(value, name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			cacheData[name] = value;
			uni.setStorageSync(this.cacheKey, cacheData);
		},
		// 删除缓存
		removeCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			delete cacheData[name];
			uni.setStorageSync(this.cacheKey, cacheData);
		}
	}
};
</script>

<style lang="scss">
$uni-base-color: #6a6a6a !default;
$uni-main-color: #333 !default;
$uni-secondary-color: #909399 !default;
$uni-border-3: #e5e5e5;
$uni-primary: #2979ff !default;
$uni-success: #4cd964 !default;
$uni-warning: #f0ad4e !default;
$uni-error: #dd524d !default;
$uni-info: #909399 !default;

/* #ifndef APP-NVUE */
@media screen and (max-width: 500px) {
	.hide-on-phone {
		display: none;
	}
}

/* #endif */
.uni-stat__select {
	display: flex;
	align-items: center;
	// padding: 15px;
	/* #ifdef H5 */
	cursor: pointer;
	/* #endif */
	width: 100%;
	flex: 1;
	box-sizing: border-box;
}

.uni-stat-box {
	background-color: #fff;
	width: 100%;
	flex: 1;
}

.uni-stat__actived {
	width: 100%;
	flex: 1;
	// outline: 1px solid #2979ff;
}

.uni-label-text {
	font-size: 12px;
	font-weight: bold;
	color: $uni-base-color;
	margin: auto 0;
	margin-right: 5px;
}

.border-bottom {
	border-bottom: solid 1px $uni-border-3;
}

.border-default {
	border: 1px solid $uni-border-3;
}

.uni-select {
	font-size: 12px;
	box-sizing: border-box;
	border-radius: 4px;
	padding: 0 5px;
	padding-left: 10px;
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	user-select: none;
	/* #endif */
	flex-direction: row;
	align-items: center;
	width: 100%;
	flex: 1;
	min-height: 35px;

	&--disabled {
		background-color: #f5f7fa;
		cursor: not-allowed;
	}

	&--wrap {
		height: auto;
		min-height: 35px;
		// align-items: flex-start;
	}
}

.uni-select__label {
	font-size: 16px;
	// line-height: 22px;
	height: 35px;
	padding-right: 10px;
	color: $uni-secondary-color;
}

.uni-select__input-box {
	// height: 35px;
	width: 0px;
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	align-items: center;

	&--wrap {
		.uni-select__input-text {
			margin-right: 8px;
		}
	}

	.padding-top-bottom {
		padding-top: 5px;
		padding-bottom: 5px;
	}

	.slot-content {
		width: 100%;
		display: flex;
		flex-direction: row;
		flex-wrap: wrap;
	}
}

.uni-select__input {
	flex: 1;
	font-size: 12px;
	height: 22px;
	line-height: 22px;
}

.uni-select__input-plac {
	font-size: 12px;
	color: $uni-secondary-color;
}

.uni-select__selector {
	/* #ifndef APP-NVUE */
	box-sizing: border-box;
	/* #endif */
	position: absolute;
	left: 0;
	width: 100%;
	background-color: #ffffff;
	border: 1px solid #ebeef5;
	border-radius: 6px;
	box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
	z-index: 3;
	padding: 4px 0;
}

.uni-select__selector-scroll {
	/* #ifndef APP-NVUE */
	max-height: 200px;
	box-sizing: border-box;
	/* #endif */
}

/* #ifdef H5 */
@media (min-width: 768px) {
	.uni-select__selector-scroll {
		max-height: 600px;
	}
}

/* #endif */

.uni-select__selector-empty,
.uni-select__selector-item {
	/* #ifndef APP-NVUE */
	display: flex;
	cursor: pointer;
	/* #endif */
	flex-direction: row;
	align-items: center;
	line-height: 30px;
	font-size: 12px;
	/* border-bottom: solid 1px $uni-border-3; */
	padding: 0px 10px;
}

.uni-select__selector-item-check {
	margin-left: auto;
}

.uni-select__selector-empty:last-child,
.uni-select__selector-item:last-child {
	/* #ifndef APP-NVUE */
	border-bottom: none;
	/* #endif */
}

.uni-select__selector__disabled {
	opacity: 0.4;
	cursor: default;
}

.uni-select__selector__isactive {
	color: #B19561 !important;
}
/* picker 弹出层通用的指示小三角 */
.uni-popper__arrow_bottom,
.uni-popper__arrow_bottom::after,
.uni-popper__arrow_top,
.uni-popper__arrow_top::after {
	position: absolute;
	display: block;
	width: 0;
	height: 0;
	border-color: transparent;
	border-style: solid;
	border-width: 6px;
}

.uni-popper__arrow_bottom {
	filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
	top: -6px;
	left: 10%;
	margin-right: 3px;
	border-top-width: 0;
	border-bottom-color: #ebeef5;
}

.uni-popper__arrow_bottom::after {
	content: ' ';
	top: 1px;
	margin-left: -6px;
	border-top-width: 0;
	border-bottom-color: #fff;
}

.uni-popper__arrow_top {
	filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
	bottom: -6px;
	left: 10%;
	margin-right: 3px;
	border-bottom-width: 0;
	border-top-color: #ebeef5;
}

.uni-popper__arrow_top::after {
	content: ' ';
	bottom: 1px;
	margin-left: -6px;
	border-bottom-width: 0;
	border-top-color: #fff;
}

.uni-select__input-text {
	// width: 280px;
	width: 100%;
	color: $uni-main-color;
	white-space: nowrap;
	text-overflow: ellipsis;
	-o-text-overflow: ellipsis;
	overflow: hidden;

	&--wrap {
		white-space: normal;
		text-overflow: initial;
		-o-text-overflow: initial;
		overflow: visible;
		word-wrap: break-word;
		word-break: break-all;
		// line-height: 1.5;
	}
}

.uni-select__input-placeholder {
	color: $uni-base-color;
	font-size: 12px;
	margin: 1px 0;
}

.uni-select--mask {
	position: fixed;
	top: 0;
	bottom: 0;
	right: 0;
	left: 0;
	z-index: 2;
}

.align-left {
	text-align: left;
}

.align-center {
	text-align: center;
}

.align-right {
	text-align: right;
}
</style>
